Method for treating water with high recovery rate by using membrane method

A high recovery rate, water treatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve the problem of high anti-corrosion requirements, unstable effect, Problems such as large technical volume, to achieve the effect of long technical service life, stable water outlet effect and high filtration accuracy

Inactive Publication Date: 2013-01-30
NANJING NANZI KELIN SYST ENG
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Problems solved by technology

[0012] (4) For the injection of RO concentrated water into deep underground wells, the anti-corrosion requirements of the injection pipe are high, the places where the concentrated water is injected into the land ar

Method used

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Examples

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Embodiment Construction

[0041] The present invention will be further illustrated below in conjunction with specific examples. This example is implemented on the premise of the technical solution of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0042] A high recovery rate membrane water treatment method, comprising the steps of:

[0043] Step 1: dosing (adding lime and Na2CO3)

[0044] Add lime to the adjustment box containing reverse osmosis concentrated water to adjust the PH value (PH value is controlled at 7-9), eliminate the temporary hardness, and reduce the magnesium ion to below 25mg / L; then add Na to the reaction box 2 CO 3 Eliminate permanent hardness, and at the same time, in order to ensure the precipitation effect, you can add flocculant and stir evenly to make Ca and Mg ions form Mg(OH) 2 and CaCO 3 Precipitation, when the calcium ion content drop...

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Abstract

The invention discloses a method for treating water with high recovery rate by using a membrane method. The method comprises the following steps of: 1, adding lime and Na2CO3; 2, magnetizing raw water; and 3, purifying the raw water by using a ceramic micro-filtration membrane, and finally recycling the water. By the method, the recovery rate of a reverse osmosis system can be more than 90 percent; the one-off investment expense is low, and the service life of equipment is long; and the membrane cleaning cycle is prolonged, so that the operating cost is low. The filtration precision is high, the water outlet effect is stable, and the occupied area is small; and the problem that the high-salt reverse osmosis concentrated water is difficult to drain can be effectively solved.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a reverse osmosis concentrated water treatment method. Background technique [0002] At present, the treatment methods of reverse osmosis RO concentrated water are mainly as follows: [0003] (1) After recovery, it is used as water for backwashing in the front stage of the process. Since there is no suspended matter in RO concentrated water, it contains antiscalant and has pressure, it can be used as backwash water, dust removal water, ash and slag flushing water, cooling water for filtration technology; or it can be mixed into raw water for recycling after simple treatment. If the concentrated water contains environmental priority control pollutants, it needs to be used with caution. [0004] (2) Evaporation, distillation and concentration. The evaporation pond method for concentrated water is suitable for areas with hot climate, high evaporation rate, low annual rainfall, vast l...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F1/44
Inventor 王春
Owner NANJING NANZI KELIN SYST ENG
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